CJ

Transfomer Winding Supplies
« on: December 29, 2009, 01:23:40 AM »
this EIS place has Nomex, mylar tape, poly insul, magnet wire, tools,

http://www.eis-inc.com/




Lams:  Magnetic Metals >  http://www.magmet.com/page1.php

or evilbay for Nickel

Bobbins:  Cosmo Corp > http://www.cosmocorp.com/en/index.cfm?loc=1&

M6 Lams and Bobbins, Brackets, End Bells -  Ram Sales > http://ramsales.net/
« Last Edit: December 29, 2009, 01:32:46 AM by CJ »
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html


PRR

Re: Transfomer Winding Supplies
« Reply #1 on: December 29, 2009, 01:54:32 AM »
Thanks.

You mentioned E-I lam-stacks 2x2, 3x3, etc; not flipped at every layer, but not butted. MagMet has a chart in a paper:
http://www.magmet.com/pdf/TransformDesignConsiderat.pdf

See page 4, Fig 10.

For zero DC, off the left side of the chart, straight 1x1 stack gives the best permeability; but 2x2 gives 80% perm with maybe 80% of the labor. In many small power transformers, low perm is not a problem but low cost wins the contract, just pointing that out.

If you have DC.... take a Champ output transformer. Say 2,500 turns and 40mA. That's 100 Ampere-Turns. Slide to the right, 100AT gives best perm with a good fat butt.

In audio SE OTs, the turns and the amps go together. Oh, if you needed NO bass (super-tweeter driver), thus low perm is OK, you might run near 10 AT, and then a 3x3 stack is better than either 1x1 or a butt. But that's an unusual case.

I think the iron you have been looking at is push-pull, nominally zero DC, but they want a 10% allowance for DC unbalance. That will tend to hit near 10AT and a 3x3 stack.

The exact places the several options cross will depend on the lam and core dimensions. This table is computed for 0.014" EE2425, whatever that is. (Anything like a Champ OT?)

CJ

Re: Transfomer Winding Supplies
« Reply #2 on: December 29, 2009, 02:11:59 AM »
hey , thanks for that,

i got to talk to Herr Finke on the phone right before he retired,

he helped our boss design the torrid coils for our products, real nice guy, been at Mag Met 40 years,

wonder if he knows anything?  :D
 
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html


 

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